Syringe

ABSTRACT

A syringe consisting of two units, one unit being a combined needle protector, piston, and piston rod, and the other unit being a barrel and needle assembly.

United States Patent Cloyd 1 1 Nov. 5, 1974 1 1 SYRINGE 3.135.261(7/1964 Clll'l'Oll 128/22 a '3') [75} inventor: Harold S cloyd, Eric, Pa3.434.468 3/1969 B11rr,Sr, 21,11. 1. 1 8 1 FOREIGN PATENTS ORAPPLICATIONS [73] 3: Hashes Incorporated Erie 919,939 2/1963 Great131116111 128/218 R 242.700 1/1963 Australia 128 218 R 1221 Filed: Sept.24, 1970 1.333.235 6/1963 France 128/218 P 366.126 1/1963 Switzerland128/218 R 1 1 pp 1 01 5.121 870,669 6 1961 016111 Britflll'l 128/2201521 US. Cl. 128/218 P Primary Exami'wr"Richard Gaudct 1511 1111. c1A61m 5/22 McGowan [58] Field 01 Search 128/218 P, 218 PA, 218 R,Attorney 8 01 Firm-Ralph Hammar 26,1218 N 57] ABSTRACT A syringeconsisting of two units, one unit being a [561 References Cited combinedneedle protector, piston, and piston rod, UNITED STATES PATENTS and theother unit being a barrel and needle assembly. 2.959.171) 11/1961) Laub128/218 N 6 Claims, 3 Drawing Figures N l/ '1 8 1 N 8 SYRINGE Thisinvention is a syringe which in a preferred form consists of two units,one unit being a combined needle protector, piston, and piston rod, andthe other unit being a barrel and needle assembly.

In the drawing,

FIG. 1 is a longitudinal section through the syringe with the partsassembled for shipment,

FIG. 2 is a similar section with the parts assembled for use, and

F IG. 3 is an enlarged fragmentary section through the piston and theadjacent portion of the barrel.

The syringe comprises a needle barrel assembly I and a combined needleprotector, piston rod, and piston 2. Each of these parts is adapted tomanufacture as a separate unit from molded plastics.

The needle 3 has its upper end molded into a needle hub 4 at the lowerend of the barrel. The needle is preferably secured in the hub by a bend5 which mechanically anchors the needle in the hub. Other expedients areknown for securing the needle in the hub. Surrounding the hub is anintegral downwardly extending cylindrical flange 6 over which the upperend of the needle protector 2 is telescoped. The fit between the flange6 and the needle protector is adequate to hold the needle protector inplace during shipment. If the hub 4 were of larger diameter, the flange6 would not be needed. At the upper end of the barrel are integralfinger grip projections 7 for holding the barrel during use. At theextreme upper end of the barrel is an enlarged taper 8 for leading thepiston into the bore of the barrel.

The needle protector piston assembly 2 is of generally tubular shapewith an outwardly extending flange 9 at its upper end and closed at itslower end by conical walls 10 complementary to the frusto-conicalsurfaces II at the lower end of the barrel. The outer surface of theneedle protector has an outside diameter sufficiently smaller than theinside diameter of the barrel to provide a loose, sliding fit whenassembled into the barrel as shown in FIG. 2. At the lower end of theneedle protector are two outwardly projecting sealing members whicheither separately or together provide a fluidtight seal with the bore ofthe barrel. The lowermost seal comprises an annular flange 12 having itsupper end integral with the needle protector at l3 and inclineddownwardly and outwardly at an acute angle to the axis of the needleprotector. The flange l2 terminates in a thick, non feathered edge 14having an outside diameter sufflciently larger than the bore of thebarrel so as to provide a fluid-tight seal. The flange 12 is in effectcantilevered at 13 and the free end 14 is deflected inward from thedotted line position to the full line position as shown in FIG. 3 toprovide the required sealing pressure. At point 13, the part 2 isrelatively rigid due to the reinforcing action obtained from the conicalwalls 10.

An additional seal is provided by an annular rib 15 having a peripheraledge 16 of a slightly larger outside diameter than the bore of thebarrel 1. When inserted in the barrel of the bore, the side wall of thepart 2 may deflect inwardly as indicated at 17 to limit the sealingpressure. At this point the side wall is yieldable and provides a springaction similar to the cantilevered flange 12. The rib 15 is of generallysawtooth configuration with an abrupt shoulder 18 facing the lower endof the part 2 and an inclined face 19 facing the open end of the part 2.

The parts 1 and 2 are shipped assembled in a first mode of assembly asshown in FIG. 1 with the part 2 serving as a protector for the needle 3.The assembly would be over packed in a sterile package.

Upon arriving at the point of use, the assembly of FIG. 1 would beremoved from its package and the needle protector 2 inserted in thebarrel 1 in a second mode of assembly until the conical wall 10 bottomson the surfaces 11 as shown in FIG. 2. In this position,

sealing contact with the bore of the barrel is established between theedge 14 of the flange l2 and the surface 16 of the rib 15. The sealingcontact of the flange of the edge 14 is adequate so the rib 15 isusually not necessary. By retracting the part 2 from the barrel l,asuction is developed for filling the syringe through the needle 3 in theusual manner. Then, by pushing the part 2 inward, the fluid is expelledor ejected. During the pressure or ejection stroke, the flange 12 issubject to hydraulic action due to the fluid pressure on the surface 20which increases the sealing pressure.

The parts 1 and 2 are adapted to plastic molding from the usual plasticssuch as polyethylene, polypropylene, etc. The manufacturing cost is lowenough so that the syringe may be used once and then thrown away.

What is claimed is:

l. A syringe consisting essentially of first and second units which maybe assembled end to end in either of two modes, namely, a first mode toprotect the needle or a second mode as an operative syringe,

the first unit comprising a barrel and needle assembly in which thebarrel is open at one end and closed at the other end by a needle hubfixed to the barrel and in which the needle has one end fixed to the huband communicating withthe bore of the barrel and has the other endprojecting from the hub for presentation to an injection site, I thesecond unit comprising a combined needle protector, piston and pistonrod having a body which is closed at oneend and has a needle receivingrecess entering the other end of the body, the closed end of the bodyhaving structure acting as a piston making sealing engagement with thebore of the barrel when the closed endof the body is inserted in thebarrel, the other end of the body having means for releasably couplingit to the closed end of the barrel with the needle received in saidrecess, and

in said first mode of assembly the body serving as a needle protectorwhen coupled to the closed end of the barrel,

in said second mode of assembly the closed end of the body being apiston making sealing engagement with the bore of the barrel when theclosed end of the body is inserted in the barrel with the other end ofthe body remote from the closed end of the barrel and the body thenbeing a piston rod for reciprocating the piston. 2. The syringe of claim1 in which the first .unitis a one piece barrel and hub.

3. The syringe of claim 1 in which the second unit is in one piece offlexible plastic.

4. The syringe of claim 3 in which the body has tubular walls betweenits ends with a loose sliding fit in the bore of the barrel.

5. The syringe of claim 4 in which the piston has an 6. The syringe ofclaim 4 in which the piston has an integral flange extending outward froSaid tubular external rib integral with the tubular walls and engagingwalls at an acute angle toward the closed end of the the bore of thebarrel.

body and has a non feathered edge contacting the bore of the barrel. 5 g

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NO-3.845.762 Dated November 5, 1974 Inventor(s) Harold S. Cloyd It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

The Assignee should read:

-- Nosco Plastics Incorporated Signed and Scaled this Thirty-first Dayof May 1977 [SEAL] Arrest:

RUTH C. MASON C. MARSHALL DANN 411931918 ff Commissioner nfParents andTrademarks

1. A syringe consisting essentially of first and second units which maybe assembled end to end in either of two modes, namely, a first mode toprotect the needle or a second mode as an operative syringe, the firstunit comprising a barrel and needle assembly in which the barrel is openat one end and closed at the other end by a needle hub fixed to thebarrel and in which the needle has one end fixed to the hub andcommunicating with the bore of the barrel and has the other endprojecting from the hub for presentation to an injection site, thesecond unit comprising a combined needle protector, piston and pistonrod having a body which is closed at one end and has a needle receivingrecess entering the other end of the body, the closed end of the bodyhaving structure acting as a piston making sealing engagement with thebore of the barrel when the closed end of the body is inserted in thebarrel, the other end of the body having means for releasably couplingit to the closed end of the barrel with the needle received in saidrecess, and in said first mode of assembly the body serving as a needleprotector when coupled to the closed end of the barrel, in said secondmode of assembly the closed end of the body being a piston makingsealing engagement with the bore of the barrel when the closed end ofthe body is inserted in the barrel with the other end of the body remotefrom the closed end of the barrel and the body then being a piston rodfor reciprocating the piston.
 2. The syringe of claim 1 in which thefirst unit is a one piece barrel and hub.
 3. The syringe of claim 1 inwhich the second unit is in one piece of flexible plastic.
 4. Thesyringe of claim 3 in which the body has tubular walls between its endswith a loose sliding fit in the bore of the barrel.
 5. The syringe ofclaim 4 in which the piston has an integral flange extending outwardfrom said tubular walls at an acute angle toward the closed end of thebody and has a non feathered edge contacting the bore of the barrel. 6.The syringe of claim 4 in which the piston has an external rib integralwith the tubular walls and engaging the bore of the barrel.